Mr.Haas has a list of coils he recommends using with his device and rates them as to good, better, best, etc.
I am using the Crane Fireball coil.
You need to be careful with this ignition. It throws lightening bolts to the plugs and you don't want to be mistaken as a spark plug.
I think the significant comment he makes in general about coils is that in his research he could not find any cylindrical coils that were capable of producing sufficient voltage.
Here is the link for the device. The installation instructions are there as a hyperlink.
There is a section in it about selecting coils.
Unfortunately there were no yellow ones included at this time. There are red and blue though.
Mine is black.
http://pantera-electronics.com/eis.htm
There simply does not appear to be any rhyme nor reason to why the MSD works or does not for some?
MSD has been around seemingly forever and it is entirely possible that the reliability of the product has been drastically improved?
I gave up on it in the '80s and have no intention of returning to it. Once bitten...twice shy.